Automatic lock-nut.



R. W. BURNETT.

AUTOMATIC LOCK NUT. APPLICATION FILED Nov.30.1915.

;- 1,228,881 i h PatentedJune 5,1917.

RALPH W. BURNETT, 0F WES'IWOOD, CALIFORNIA.

AUTOMATIC LOCK-NUT.

Specification of Letters Patent.

Patented June 5, iai v.

Application led November 30, 1915. Serial No. 64,324.

To all whom t may concern.

Be it known that I, RALPH W. BURNETT, a citizen of the United States, residing at Westwood, in the county of Lassen and State of California, have invented new and useful Improvements in Automatic Lock- Nuts, of which the following is a specification.

This invention relates to improvements in nut locking devices and especially with reference to the provision of a nut of special construction and a key washer and locking spring which Acoact with the nut and with a base element to automatically lock the nut when the same is screwed up on the bolt and eifectually prevent the nut from working loose but which enables the nut to be removed when desired.

The invention consists in the features of construction, combination and arrangement of devices herein fully described and claimed.

In the accompanying drawings Figure 1 is an elevation of a bolt and a sectional view of the nut locking devices on the bolt constructed and arranged in accordance with my invention.

Figs. 2 3 are detail sectional views on the planes indicated by the lines ct and o o, respectively, of Fig. l.

Fig. 4 is an inverted detail perspective view of the nut.

Fig. 5 is a detail perspective view of the base washer.

Fig. 6 is a detail perspective view of the key washer.

Fig. 7 is a similar view of the annular locking spring.

`The bolt 1 is here shown of the usual construction and is shown as arranged in and passing through an opening in a beam or other object 2. The nut 3 is provided `on its inner face with segmental teeth 4L,

each of which has an inclined face 5, the corresponding faces of all of the teeth being inclined in the same direction.

A base element is here indicated as a washer 6, having an opening through which the bolt passes, and said base element or washer is provided in its outer side with teeth 7 which correspond with those of the nut. base element and as desired may be formed directly on the work or object through which the bolt extends, within the scope of my invention. I would have it understood that the base element may be of any suit- These teeth may be formed in any able construction and is not necessarily a and a tooth of the base element or washer 6.

The teeth and the spring enable the nut to be turned by a wrench and serve by their coaction to automatically and securely lock the nut on the bolt.

To loosen or take off the nut the bolt must be held against turning by any suitable means, a wrench used on the nut and a second wrench used on the key washer-*and manipulated to turn the key washer while the nut is being held'against turning, a suiicient distance to cause the end 12 of the locking spring to be disengaged from the tooth of the nut. The key washer is then held against rotation and the nut reversely turned and freely taken from the bolt. The base washer is provided with biting flanges 13 on its outer side to engage in the surface of the bolted material or member 2.

Having thus described my invention, I claim In combination with a bolt or the like, a base element through which the bolt eX- tends, and having segmental teeth on its outer side around the bolt, each of said teeth having an inclined face, a nut on the bolt having corresponding segmental teeth on its inner side, a key washer between the base element and the nut, and through which the bolt extends, said key washer having a segmental enlargement at one side of the opening therein and presenting an inclined camming face on the side opposed to the nut and spaced from the inner surface of the key Washer, said kkey Washer being tooth of the nut, the said segmental enlargethicker than said segmental enlargement nient of the key Washer being arranged 1o and an annular locking spring open at one under one side of said locking spring. Y side, arranged in 'the opening of the key In testimony whereof I aii'iX my signature Washer and between the nut andthe base in presence of a Witness.

element and having its ends sprung in oppo- RALPH W. BURNETT. site directions and respectively `engaged lVitness: t With a tooth of the base element, and a Y JAMES J. KERRIGAN.

Copies of this patent may be obtained for ve cents each, by addressing the ACoxnmissioner of Patents,

f Washington, D. C. 

